Two weeks I ago I wake up (I slept on left side) with pain in part of my left chest, not precisely located in one point but I could say that was around heart area. It was a sharp pain that would intensify while moving, especially when I bend over. First day it reacted certain times when I put pressure on some part of left chest, pain would go up and when one time I pressured so hard, sharper pain started with a hard difficulty breathing, that lasted around 2 minutes then it returned to "normal" pain. When I sat or walk slowly without chest movement everything was little easier. This situation lasted 4 days, every day was a little lighter. In those four days I also couldn't sleep on left side. I been to my doctor after that, he said that doesn't sound like heart pain because it wouldn't stop in stillnes - rest. He said that this could be nerve or muscle. He measured blood pressure, it was normal. After that I didn't have any problems with this. Regarding my story it all seems like this wasn't heart problem. Should I go to some additional tests?